Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Jul. 31, 2013
Income tax expense (benefit)	$ (77,000,000)		$ 29,000,000	$ (10,000,000)	$ 96,000,000
US federal statutory income tax rate	35.00%		35.00%	35.00%	35.00%
Effective income tax rate				37.00%	31.00%
Valuation allowance release	$ 100,000,000	$ 179,000,000
Tax expense related to repatriation of foreign earnings	1,000,000		$ 2,000,000	$ 4,000,000	$ 5,000,000
Tax expense related to other adjustments	1,000,000			7,000,000	$ 5,000,000
Deferred tax asset valuation allowance reasonably likely to reverse in next twelve months	$ 400,000,000			$ 400,000,000
Senior Notes Sold In 2013 [Member]
Senior notes issued						$ 750,000,000
ITALY
Tax expense related to settlements of outstanding tax matters			$ 2,000,000